CVE-2026-84520: Apple macOS

Critical severity, CVSS 9.8. EPSS: 0.4% chance of exploitation in the next 30 days.

A buffer overflow was addressed with improved size validation. This issue is fixed in macOS Golden Gate 27. A local attacker may be able to cause unexpected system termination or corrupt kernel memory.

Affected products

• Apple macOS: before 27.0 (fixed in 27.0)

Published 2026-09-14. Last modified 2026-09-16.